According to one Saudi newspaper, the following will be the imams that will lead taraweeh in Makkah Insha'Allah:

Sheikh Abdur Rahman As-Sudais
Sheikh Saud Ash-Shuraim
Sheikh Abdullah Al-Juhany
Sheikh Mahir Al-Muaiqily

They will lead in the following order:
Night 1 (and all odd days with the exception of last 10 nights):
1st 10 rakaats will be led by Sheikh Saud Ash-Shuraim
last 10 Rakaats will be by Sheikh Mahir Al-Muaiqily
(we are assuming Sheikh Muaiqily will lead qunoot)

Night 2 (and all even nights with the exception of last 10 nights):
1st 10 Rakaats led by Sheikh Abdur Rahman As-Sudais
Last 10 Rakaats led by Sheikh Abdullah Al-Juhany
(we are assuming Sheikh Al-Juhany will lead qunoot)

As for Tahajjud Salaat, it will be Sheikh Abdur Rahman Al-Sudais and Sheikh Saud Ash-Shuraim Insha'Allah. And for Khatam ul Quran Dua, it will be Sheikh Abdur Rahman As-Sudais Insha'Allah.
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Once again, this is from a Saudi Newspaper; not from us :)

EDIT:
According to a different source, the following will be the order:

First Night Sheikh Juhany and Sheikh Sudais (Sheikh Sudais probably doing qunoot)

Second Night Sheikh Shuriam and Sheikh Maahir (Sheikh Mahir probably doing qunoot)

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Jazka'Allah khairan
Assalaam u alaikum